Core-box machine



(NoMo'deL f 7 v V J. S. $TBPHENS & G. E. BRUSH. 4 7

- GORE BOX MACHINE.

No. 577,792. Patented Feb. 23, 1897.

I I l l I a 1 NITED I STATES ATENT OFFICE.

CORE-BOX MACHINE.

SPECIFICATION forming part of Letters Patent No. 577 ,7 92, dated February 23, 1897.

Application filed April 16, 1895.

To all whom, it may concern.-

Be it known that we, JOHN S. STEPHENS and GEORGE E. BRUSH, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Gore-Box Machines; and we do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention contemplates the production of a new and improved machine for making core-boxes, and is specially designed for the use of pattern-makers.

The object of the invention is to provide a simple and highly-efficient machine of this class for the manufacture of core-boxes with either a straight or curved groove 0r cut-out from about three-fourths of an inch to twentyfour inches in diameter, which diameter can be readily varied within the limit specified. These objects are accomplished by providing a stand or frame with a table-top capable of being raised and lowered and formed with a longitudinal slot, in which rotates a cutterhead carried bya shaft mounted in said frame. The table-top can be tilted on a horizontal axis at right angles to said shaft and can be raised and lowered without affecting such tilting means. A straight guide mounted on the table-top guides the block of wood while being subjected to the action of the cutters, and when an elbow curve is to be formed the block is temporarily attached to the free end of a pivoted arm.

The invention will be hereinafter fully set forth, and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a side View partly in section. Fig. 2 is a plan view. Fig. 3 is an end view. Figs. 4 and 5 represent, respectively, views of straight and curved or elbow core-boxes. Fig. 6 illustrates the knife. Fig. 7 is a detail.

Referring to the drawings, A designates the frame; a, a table adjustable 011 said frame by means of a threaded shaft a, operating in bearings and provided with a bevel gear-wheel a engaging a'similar wheel a on a shaft (1 which latter has a hand-wheel a on its outer end. In the top of this table is an approxi- Serial No. 545,905. (No model.)

mately T-opening a", the lateral branches of which extend longitudinally in said top.

13 is the cutter-head, mounted on a rotary shaft 1), journaled in frame A on a line with the main portion of the opening 04 On this shaft is a pulley b, which is engaged by a belt 5 which encompasses a driving-wheel 11 A pulley 6 whose shaft extends through a slot 12 on the frame, compensates for any slack in belt U The cutter-head B'consists of a central hub b and two opposite narrow lateral arms 0. In the outer ends of these arms are knives or cutters D, adjustably held by setscrews d. These knives or cutters consist each of a shank d and an outer narrow cutting end d which is substantially concentric with the operating-shaft and extended to one side in the direction of the line of travel. The knives or cutters being narrow in width act upon but a limited portion of the block in the formation of the core-box, that is, but a narrow portion is being cut or acted upon at any one time, the gradual movement of the block, so as to be further subjected to the ac tion of the knives or cutters, serving to increase the length of or complete the groove or cut-out.

In making a straight longitudinal groove or cut-out (see Fig. 4) the block is passed over the longitudinal opening in the table-top directly above the cutter-head and is held tight against a guide E, which is adjustable on the top of the table and is held at any desired point by clamps e. In the formation'of an elbow core-box the block of wood is passed over said opening and cutter-head in a circular plane, the center of the circle described thereby being lateral to the cutter-head.

The preferred form for holding the block when an elbow curve is being formed consists in temporarily attaching the same to an arm F, which is free to swing on its pivot f, which latter consists of a clam pf, adjustable in a slot f in line with the longitudinal portion of the opening in which the cutter-head revolves. By adjusting the height of the table the depth of the groove or cut-out can be increased or diminished at pleasure, and also a cut-out of variable depth at difierent points can be effected when a chambered core-box is desired. To enable the work or block to be presented to the knives or cutters at an inclination, the top of the table is capable of being adjusted on a horizontal axis at right angles to the shaft of the cutter-head and held at any angle by an arm G, connected thereto and provided with a curved slot g, through which works a clamp g.

It will he understood that as the work of cutting out the core-block progresses the table-top is gradually lowered, thereby increasingthe depth of the cut.

The advantages of our invention are ap parent to those skilledin the art to which it appertains.

It will be specially observed that we have produced an extremely simple and inexpensive machine for making core-boxes with longitudinal grooves or cut-outs either straight or curved and of any desired diameter, either uniform or variable.

We are aware that heretofore machines have been produced for making wood moldin gs by passing a curved block longitudinally over an opening in the table in which work the cutting-knives, and also that circular cutting-heads having oppositely-inclined planes and knives secured thereon having inclined cutting edges have been used; but these machines, while bearing a superficial resemblance to our invention, are incapable of performing the office for which we have design ed the machine herein described. None of said machines is capable of making a core-box from a solid block of wood. In our invention the block is held down to the table and gradually moved over the cutter-head, the cut-out being formed longitudinally of the length of the block, and the vertex of said cut-out is parallel with the axis of the cutter-head.

We claim as our invention- 1. In a core-box machine, the combination of the stand or frame, the table having its top provided with a longitudinal slot, a rotary shaft, a cutter-head on said shaft rotatable in said slot, means for tilting said table-top on a horizontal axis at right angles to said shaft, and means for raising and lowering said table-top without afiecting said tilting means, substantially as set forth.

2. The herein-described machine for forming core-boxes from a solid block of wood, comprising a stand or frame, a table thereon capable of being raised and lowered and having its top provided with a longitudinal slot over which said block is designed to be moved, the adjustable straight guide mounted on said top at right angles to said opening, a rotary shaft, a cutter-head thereon rotatable in said longitudinal slot, and means for tilting said table-top on a horizontal axis at right angles to said rotary shaft, said cutter-head having opposite adjustable knives the line of travel of which is concentric with the axial center of the cutter-head, said block being held down on said table-top against said guide and gradually moved over said cutter-head, substantially as set forth.

3. The herein-described machine for forming core-boxes from a solid block of wood, comprising the adjustable table having an opening in its top over which said block is designed to be moved, said table having a slot therein ex tended in the direction of said opening, a rotary cutter-head designed to rotate in said opening and having opposite knives the outer ends of which are narrow and concentric with the axial center of the cutterhead, the vertex of said cut-out in said block being parallel with the axis of said cutterhead, the arm designedto swing over said table parallel with the top thereof and to one end of which said block is designed to be temporarily attached, and the pivot-clamp working in said slot and designed to pivotally support said arm, substantially as set forth.

In testimony whereof we have signed this specification in the presence of two subscribing witnesses.

JOHN S. STEPHENS. GEO. E. BRUSH.

Witnesses:

ALBERT F. BENKART,

J N0. MCGILL. 

